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Closed book
01
someone or something one knows very little or nothing about
Idiom
InformalWhat is the origin of the idiom "closed book" and when to use it?
The idiom "closed book" is believed to have originated in the 19th century. It is thought to have come from the literal meaning of a closed book, which is a book that is not open and cannot be read. The phrase "closed book" came to be used to describe someone or something that one knows very little or nothing about. It suggests that the person or thing in question is a mystery to the speaker.
Examples
The workings of the stock market are a closed book to me – I do n't understand how it works.
The new technology is a closed book to most people – they're not familiar with it yet.
